'90s Halloween Costumes: Spice Girls What to wear for Posh: A short, skintight black dress or lacy slip with stilettos. What to wear for Ginger: A Union Jack minidress and matching platform shoes. What to wear for Sporty: A sports bra, tearaway pants, and sneakers. What to wear for Scary: Anything leopard print, with heels and curled, teased hair. What to wear for Baby: A pink dress and platform sneakers with a choker and pigtails. How to act: Like you wanna slam your body down and wind it all around. Image Source: Everett Collection